Question

Define lustre. Give the lustre of diamond.

Answer 1

Lustre is gentle shining light that is reflected from a surface, for example from polished metal.

The luster of Diamond is excellent. Diamond exhibits great "fire" and brilliance, which gives it a shiny, freshly polished look. Rough Diamonds exhibit a greasy luster, but proper cutting give them a powerful adamantine luster. Only synthetic substances and a few minor gemstones can reach or excel the refractive index of Diamonds.

HOPE IT HELPS ☺☺